I've always had a small quantity of metal flakes on the filter surface - steel mesh type. Last night, in prepping for this weekend's GP in Virginia City, NV I noticed more than usual amount of metal chips and flakes mostly piled in two of the filter pleats. Worse is that some of the particles are magnetic. I took the bike out Sunday for a pre-weekend shakedown ride and it ran beautifully with no abnormal noises. I should note that one intake valve is a little tight which I will address after this coming weekend. A tight valve won't cause this kind of result though to the best of my knowledge. I change the oil every 6-10 hours of riding time. Is that a bearing taking a crap? Its a tough situation: * bike runs great. * been plannning this weekend for a couple of months now. * supposed to leave Thurs morning. * don't want to pay for a total engine rebuild. I bought the bike used a year ago and have about 70 hours on it. Who knows how many previously... Any thoughts?